Corrupt Frontpage Extensions on Ensim Server

A user in my Ensim 3.1.1 server has corrupted his frontpage extensions, probably by accessing the server via FTP, although I told him a hundred times not to do it.

How can I repair the extensions without deleting and recreating the site in the appliance control panel?

I've already tried to disable the extensions for this site and then re-enable them, but no success.

Any suggestion? Thank you.

 

 

 

 

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